

720 SUMMARY OF CURRENT RESEARCHES. 



Structure of Copper- Antimony Alloys.* — J. E. Stead contributes 

 a microphotograph showing the value of the " superposing " method for 

 the preparation of alloys to be studied under the Microscope. The 

 method consists of first melting the metal of highest specific gravity 

 and then pouring on top of this, in a molten condition, the other, 

 lighter metal. The two metals will alloy in such a manner that a ver- 

 tical cross-sectioa will show crystals of a pure metal at one end and 

 crystals of the other metal at the other end, while between these the 

 metals will be found alloyed in all proportions. 



C. H. — The Microscope and the Metallurgy of Steel. 



Railroad Gazette, June 13. 1902; and 

 Metallographist, V. (1902) pp. 240-4 (4 figs.). 

 Campbell, W. — Structure of Metals and Binary Alloys. 



[A valuable practical treatise, with many original illustrations.] 



Journ. Franklin Inst., CLIY. (1902) pp. 1-16. 131-42 (32 microphotoa). 



Hiorns, A. H. — Metallography: an Introduction to the Study of the Structure of 

 Metals, chiefly by the aid of the Microscope. 



Macmillan & Co , London, 1902, xiv. and 158 pp. and 96 figs. 



* Metallographist, v. (1902) pp. 247-8 (1 fig.). 



